Oracle V$INSTANCE视图字段说明
V$INSTANCE 显示当前实例的状态。
字段说明如下:
Column | Datatype | Description |
---|---|---|
INSTANCE_NUMBER | NUMBER |
Instance number used for instance registration (corresponds to the INSTANCE_NUMBER initialization parameter) See Also: “INSTANCE_NUMBER” |
INSTANCE_NAME | VARCHAR2(16) | Name of the instance |
HOST_NAME | VARCHAR2(64) | Name of the host machine |
VERSION | VARCHAR2(17) | Database version |
STARTUP_TIME | DATE | Time when the instance was started |
STATUS | VARCHAR2(12) |
Status of the instance: * STARTED - After STARTUP NOMOUNT * MOUNTED - After STARTUP MOUNT or ALTER DATABASE CLOSE * OPEN - After STARTUP or ALTER DATABASE OPEN * OPEN MIGRATE - After ALTER DATABASE OPEN { UPGRADE |
PARALLEL | VARCHAR2(3) | Indicates whether the instance is mounted in cluster database mode (YES) or not (NO) |
THREAD# | NUMBER | Redo thread opened by the instance |
ARCHIVER | VARCHAR2(7) | (STOPPED | STARTED | FAILED) FAILED means that the archiver failed to archive a log last time, but will try again within 5 minutes |
LOG_SWITCH_WAIT | VARCHAR2(11) | The ARCHIVE LOG/CLEAR LOG/CHECKPOINT event log switching is waiting for. Note that if ALTER SYSTEM SWITCH LOGFILE is hung, but there is room in the current online redo log, then value is NULL |
LOGINS | VARCHAR2(10) | ALLOWED |
SHUTDOWN_PENDING | VARCHAR2(3) | YES | NO |
DATABASE_STATUS | VARCHAR2(17) | Status of the database |
INSTANCE_ROLE | VARCHAR2(18) | Describes whether the instance is an active instance (PRIMARY_INSTANCE) or an inactive secondary instance (SECONDARY_INSTANCE), or UNKNOWN if the instance has been started but not mounted |
ACTIVE_STATE | VARCHAR2(9) |
(NORMAL|QUIESCING|QUIESCED). NORMAL indicates the database is in a normal state. QUIESCING indicates that the ALTER SYSTEM QUIESCE RESTRICTED statement has been issued: no new user transactions, queries, or PL/SQL statements are processed in this instance. User transactions, queries, or PL/SQL statements issued before the ALTER SYSTEM QUIESCE RESTRICTED statement are unaffected. DBA transactions, queries, or PL/SQL statements are also unaffected. QUIESCED indicates that the ALTER SYSTEM QUIESCE RESTRICTED statement has been issued: no user transactions, queries, or PL/SQL statements are processed. DBA transactions, queries, or PL/SQL statements are unaffected. User transactions, queries, or PL/SQL statements issued after the ALTER SYSTEM QUIESCE RESTRICTED statement are not processed. Note that a single ALTER SYSTEM QUIESCE RESTRICTED statement quiesces all instances in a Real Application Clusters environment. After this statement has been issued, some instances may enter into a quiesced state before other instances; the system is quiesced when all instances enter the quiesced state. |
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